Ngozi

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  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 8.97°S
  • 33.57°E

  • 2622 m
    8600 ft

  • 222164
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number

The Global Volcanism Program has no activity reports for Ngozi.

The Global Volcanism Program has no Weekly Reports available for Ngozi.

The Global Volcanism Program has no Bulletin Reports available for Ngozi.

Ngozi caldera is the most prominent volcanic feature of the Poroto Ridge, a transverse structure at the northern end of the Karonga basin. The trachytic-to-phonolitic volcano contains a 3-km-wide caldera with a 1.5 x 2.5 km lake inn the southern part of the caldera that is bounded by steep-walled cliffs 150-300 m high. Numerous pyroclastic cones are situated along the ridge. Eruption of the Kitulo Pumice, radiocarbon dated at about 10,200 cal. years Before Present, is though to be related to formation of the caldera. The youngest activity appears to have originated from the caldera and from youthful-looking pyroclastic cones to the north; the youngest known eruption produced a pyroclastic flow that swept at least 10 km to the south about 500 years ago.

Summary of Holocene eruption dates and Volcanic Explosivity Indices (VEI).

Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
1450 ± 40 years Unknown Confirmed   Radiocarbon (corrected)
8250 BCE (?) Unknown Confirmed 5 Radiocarbon (corrected) Kitulo Pumice

This compilation of synonyms and subsidiary features may not be comprehensive. Features are organized into four major categories: Cones, Craters, Domes, and Thermal Features. Synonyms of features appear indented below the primary name. In some cases additional feature type, elevation, or location details are provided.



Synonyms
Poroto Ridge


Cones
Feature Name Feature Type Elevation Latitude Longitude
Dundoli Cone 1789 m
Hatenji Cone 1945 m
Ifwoka Cone 2201 m
Ngwangu Cone 1996 m
Njolimwanya Cone 2205 m
Nzongwe Cone 2061 m
Sintumbi Cone 2170 m
Tangano Shield volcano 2146 m 8° 58' 0" S 33° 32' 0" E
Lake-filled Ngozi caldera is seen here from its southern rim. The 1.5 x 2.5 km caldera lake is bounded by steep-walled cliffs 150-300 m high. The trachytic-to-phonolitic caldera is the most prominent volcanic feature of the Poroto Ridge, a transverse structure at the northern end of the Karonga basin in SW Tanzania. Numerous pyroclastic cones are situated along the ridge. The youngest activity along the ridge appears to have originated from Ngozi caldera and from youthful-looking pyroclastic cones to the north.

Photo by David Williamson, CNRS, France.

The following references have all been used during the compilation of data for this volcano, it is not a comprehensive bibliography. Discussion of another volcano or eruption (sometimes far from the one that is the subject of the manuscript) may produce a citation that is not at all apparent from the title.

Ebinger C J, Deino A L, Drake R E, Tesha A L, 1989. Chronology of volcanism and rift basin propagation: Rungwe volcanic province, East Africa. J Geophys Res, 94: 15,785-15,803.

Fontijn K, Ernst G G J, Elburg M A, Williamson D, Abdallah E, Kwelwa S, Mbede E, Jacobs P, 2010. Holocene explosive eruptions in the Rungwe Volcanic Province, Tanzania . J Volc Geotherm Res, 196: 91-110.

Harkin D A, 1960. The Rungwe volcanics at the northern end of Lake Nyasa. Geol Surv Tanganyika Mem, 2: 1-172.

IAVCEI, 1973-80. Post-Miocene Volcanoes of the World. IAVCEI Data Sheets, Rome: Internatl Assoc Volc Chemistry Earth's Interior..

Volcano Types

Caldera
Shield(s)
Pyroclastic cone(s)

Tectonic Setting

Rift zone
Continental crust (> 25 km)

Rock Types

Major
Trachyte / Trachyandesite
Phonolite
Trachyandesite / Basaltic trachy-andesite
Basalt / Picro-Basalt

Population

Within 5 km
Within 10 km
Within 30 km
Within 100 km
456,466
456,466
604,376
2,195,623

Affiliated Databases

Large Eruptions of Ngozi Information about large Quaternary eruptions (VEI >= 4) is cataloged in the Large Magnitude Explosive Volcanic Eruptions (LaMEVE) database of the Volcano Global Risk Identification and Analysis Project (VOGRIPA).
WOVOdat WOVOdat is a database of volcanic unrest; instrumentally and visually recorded changes in seismicity, ground deformation, gas emission, and other parameters from their normal baselines. It is sponsored by the World Organization of Volcano Observatories (WOVO) and presently hosted at the Earth Observatory of Singapore.
EarthChem EarthChem develops and maintains databases, software, and services that support the preservation, discovery, access and analysis of geochemical data, and facilitate their integration with the broad array of other available earth science parameters. EarthChem is operated by a joint team of disciplinary scientists, data scientists, data managers and information technology developers who are part of the NSF-funded data facility Integrated Earth Data Applications (IEDA). IEDA is a collaborative effort of EarthChem and the Marine Geoscience Data System (MGDS).
Smithsonian Collections Search the Smithsonian's NMNH Department of Mineral Sciences collections database. Go to the "Search Rocks and Ores" tab and use the Volcano Name drop-down to find samples.